diff --git a/server/package.json b/server/package.json
index 13d54c02a4..b0b7bd8c49 100644
--- a/server/package.json
+++ b/server/package.json
@@ -35,7 +35,7 @@
     "dev": "tsx src/index.ts",
     "dev:watch": "cross-env PAPERCLIP_MIGRATION_PROMPT=never PAPERCLIP_MIGRATION_AUTO_APPLY=true tsx ./scripts/dev-watch.ts",
     "prepare:ui-dist": "bash ../scripts/prepare-server-ui-dist.sh",
-    "build": "tsc && mkdir -p dist/onboarding-assets && cp -R src/onboarding-assets/. dist/onboarding-assets/",
+    "build": "tsc && mkdir -p dist/onboarding-assets dist/built-ins && cp -R src/onboarding-assets/. dist/onboarding-assets/ && cp -R src/built-ins/. dist/built-ins/",
     "prepack": "pnpm run prepare:ui-dist",
     "postpack": "rm -rf ui-dist",
     "clean": "rm -rf dist",
diff --git a/server/src/__tests__/server-package-build-script.test.ts b/server/src/__tests__/server-package-build-script.test.ts
new file mode 100644
index 0000000000..9c4d16a916
--- /dev/null
+++ b/server/src/__tests__/server-package-build-script.test.ts
@@ -0,0 +1,18 @@
+import { readFileSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { describe, expect, it } from "vitest";
+
+const packageJsonPath = fileURLToPath(new URL("../../package.json", import.meta.url));
+
+describe("server package build script", () => {
+  it("copies static runtime asset directories into dist", () => {
+    const packageJson = JSON.parse(readFileSync(packageJsonPath, "utf8")) as {
+      scripts?: Record<string, string>;
+    };
+    const buildScript = packageJson.scripts?.build ?? "";
+
+    expect(buildScript).toContain("mkdir -p dist/onboarding-assets dist/built-ins");
+    expect(buildScript).toContain("cp -R src/onboarding-assets/. dist/onboarding-assets/");
+    expect(buildScript).toContain("cp -R src/built-ins/. dist/built-ins/");
+  });
+});